PGM511A0190BK1H2NL2L2B1B1G4 Parker Gear Motor 19cc 250bar

Product Overview

The PGM511A0190BK1H2NL2L2B1B1G4 is a precisely configured model from Parker Hannifin’s PGM511 series of heavy-duty aluminum external gear hydraulic motors. Featuring a three-piece aluminum housing and pressure-balanced bearing blocks, this motor delivers high power density and volumetric efficiency for continuous operation at up to 250 bar. Manufactured to exact Parker original specifications, it offers 100% drop-in interchangeability with genuine Parker PGM511 units—identical mounting dimensions, shaft, flange, and porting—allowing direct replacement without modification. Every unit undergoes 100% simulated duty-cycle testing to guarantee reliable performance under high-pressure and variable-speed conditions, making it ideal for mobile and industrial applications demanding compact size and long service life.

Technical Specifications

• Full Model Code: PGM511A0190BK1H2NL2L2B1B1G4
• Series: Parker PGM511 Aluminum External Gear Motor
• Displacement: 19.0 cm³/rev (1.16 in³/rev)
• Continuous Working Pressure: 250 bar (3625 psi)
• Peak / Intermittent Pressure: up to approx. 275 bar (series reference)
• Minimum Speed: 500 rpm
• Maximum Speed: 3250 rpm
• Maximum Input Flow: approx. 61.8 L/min
• Typical Torque at Working Pressure: 68.0 Nm
• Rotation: Bi-directional
• Shaft: K1 – Ø15.88 mm parallel, 4.0 mm key, SAE “A”, no thread, 32 mm length
• Mounting Flange: H2 – SAE “A” 2-bolt flange (106.4 mm centers, Ø82.55 mm pilot)
• Shaft Seal: N – NBR
• Side Ports: L2/L2 – 19 mm-Ø40 mm-M8 diamond flange (inlet/outlet)
• Rear Ports: B1/B1 – None
• Drain Port: G4 – 1/4-19 BSP rear drain
• Approximate Weight: 3.91 kg
• Body Material: High-strength aluminum
• Gear Design: 12-tooth optimized external gear profile

Key Technical Advantages

• Pressure-balanced bearing blocks combined with large journal diameters minimize bearing loads, enabling reliable continuous operation at 250 bar with high and stable volumetric efficiency.
• 12-tooth gear profile and optimized flow metering significantly reduce pressure pulsation and operating noise for quieter, smoother system performance.
• Precision-machined aluminum housing and high-strength alloy steel gears with pressure-compensated wear plates deliver low internal leakage and high mechanical efficiency over long service life.
• Modular three-piece construction and standardized SAE interfaces provide outstanding application flexibility and true drop-in interchangeability, lowering installation and maintenance costs.
• 100% simulated duty-cycle testing and optimized bearing/seal systems ensure durability under high-pressure, variable-speed conditions typical of demanding mobile and industrial applications.

Application Areas

Agricultural machinery (harvesters, mowers, fan drives), material handling equipment, construction auxiliary systems, turf and garden equipment, industrial hydraulic circuits, fan and compressor drives, and any application requiring bi-directional rotation, compact mounting, and medium-to-high pressure output.

Expert Maintenance Tips

Ensure proper shaft-to-coupling alignment during installation; flexible couplings are recommended to avoid additional radial or axial loads (specify outboard bearing versions if external loads are present). Maintain hydraulic fluid cleanliness at ISO 4406 19/17/13 or better and operate within the recommended viscosity range of 8–1000 mm²/s (optimum 20–30 cSt). Before initial start-up, fully bleed the system and confirm the G4 rear drain port is correctly connected to tank to prevent excessive shaft-seal back pressure. Periodically inspect shaft seals and port seals; avoid low-viscosity or contaminated fluids. During cold starts, limit speed to 1500 rpm and build pressure gradually to establish a proper lubricating film.